| tyrosinase-positive (ty-pos) oculocutaneous a. |
a recessive disorder characterized by reduced, but usually visible, pigmentation in hair, skin, and eyes, which varies with race and age. Onset of pigment formation is delayed, pigment accumulates with age, and intensity of accumulation depends on race; hence all ty-pos infants resemble ty-neg infants, and ty-pos adult Blacks may be darker than normal blond Caucasians. The presence of pigmented nevi distinguishes ty-pos and ty-neg Caucasians. Called also a. II, albinoidism, and complete imperfect a.
Ãâó: www.mercksource.com/pp/us/cns/cns_health_library.j...
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